Outlook asking for password Exchange 2013

Hey guys, I've tried searching to resolve this issue but it seems I've failed. I have a few Windows 7 machines external from domain that the mail server is on, some will pull the servername.domain.com and others are pulling the random-characters@domain.com. The ones that pull servername.domain.com will not keep asking for credentials every time you close Outlook. The ones that pull random-characters@domain.com will constantly require credentials at start of Outlook. I've scoured the web and about to pull my hair out, it's just so random and can't figure out why it's acting like this.

I've found that computers not connected to a domain usually have no issue, the ones connected to another domain seem to be the main problem causers.
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Josh GarrettNerdAsked:
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Mal OsborneAlpha GeekCommented:
This is pretty normal for Outlook were there are connectivity problems. Too many dropped packets and a requester pops up asking for credentials.  Happens a lot with GSM or WIFI. Probably worth checking you have good connectivity.
Josh GarrettNerdAuthor Commented:
I can setup the same account on a computer that isn't connected to a domain and never have it ask for a password after initial setup, then on a computer that is on a different domain say "STORE" instead of "DATACENTER" it will constantly ask for a password at startup of Outlook. Some of the computers on the "STORE" domain are just fine and never ask for a password as well. It's very confusing.
Josh GarrettNerdAuthor Commented:
So far, the easiest solution has been joining the accounts to the data center domain over VPN and will work on changing the local DC's to replicate the data center domain.

If anyone has any additional insight, please let me know. We have some sites that aren't all that easy to get to in case of a botched update.

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Josh GarrettNerdAuthor Commented:
Resolved myself.
Josh GarrettNerdAuthor Commented:
No solution other than to have a computer not connected to a different domain.
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